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ICU-820 implement u_getCombiningClass()

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X-SVN-Rev: 3462
This commit is contained in:
Markus Scherer 2001-01-23 23:45:21 +00:00
parent 955c80514c
commit 67201b90b4
2 changed files with 44 additions and 19 deletions
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15
icu4c/source/common/uchar.c
View File

@ -673,6 +673,21 @@ u_charMirror(UChar32 c) {
}
}
U_CAPI uint8_t U_EXPORT2
u_getCombiningClass(UChar32 c) {
uint32_t props=GET_PROPS(c);
if(!PROPS_VALUE_IS_EXCEPTION(props)) {
if(GET_CATEGORY(props)==U_NON_SPACING_MARK) {
return (uint8_t)GET_UNSIGNED_VALUE(props);
} else {
return 0;
}
} else {
/* the combining class is in bits 23..16 of the first exception value */
return (uint8_t)(*GET_EXCEPTIONS(props)>>16);
}
}
/* static data tables ------------------------------------------------------- */
struct BlockScriptMap {

48
icu4c/source/common/unicode/uchar.h
View File

@ -415,7 +415,7 @@ typedef enum UCharNameChoice UCharNameChoice;
/**
* Determines whether the specified UChar is a lowercase character
* according to Unicode 2.1.2.
* according to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the character is lowercase; false otherwise.
@ -430,7 +430,7 @@ u_islower(UChar32 c);
/**
* Determines whether the specified character is an uppercase character
* according to Unicode 2.1.2.
* according to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the character is uppercase; false otherwise.
@ -444,7 +444,7 @@ u_isupper(UChar32 c);
/**
* Determines whether the specified character is a titlecase character
* according to Unicode 2.1.2.
* according to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the character is titlecase; false otherwise.
@ -457,8 +457,8 @@ U_CAPI UBool U_EXPORT2
u_istitle(UChar32 c);
/**
* Determines whether the specified character is a digit according to Unicode
* 2.1.2.
* Determines whether the specified character is a digit according to UnicodeData.txt.
*
*
* @param ch the character to be tested
* @return true if the character is a digit; false otherwise.
@ -469,7 +469,7 @@ u_isdigit(UChar32 c);
/**
* Determines whether the specified character is an alphanumeric character
* (letter or digit)according to Unicode 2.1.2.
* (letter or digit)according to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the character is a letter or a digit; false otherwise.
@ -480,7 +480,7 @@ u_isalnum(UChar32 c);
/**
* Determines whether the specified numeric value is actually a defined character
* according to Unicode 2.1.2.
* according to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the character has a defined Unicode meaning; false otherwise.
@ -498,7 +498,7 @@ u_isdefined(UChar32 c);
/**
* Determines whether the specified character is a letter
* according to Unicode 2.1.2.
* according to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the character is a letter; false otherwise.
@ -566,7 +566,7 @@ u_iscntrl(UChar32 c);
/**
* Determines whether the specified character is a printable character according
* to Unicode 2.1.2.
* to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the Unicode character is a printable character; false otherwise.
@ -579,7 +579,7 @@ u_isprint(UChar32 c);
/**
* Determines whether the specified character is of the base form according
* to Unicode 2.1.2.
* to UnicodeData.txt.
*
* @param ch the character to be tested
* @return true if the Unicode character is of the base form; false otherwise.
@ -688,8 +688,8 @@ U_CAPI uint16_t U_EXPORT2
u_charCellWidth(UChar32 c);
/**
* Returns a value indicating a character category according to Unicode
* 2.1.2.
* Returns a value indicating a character category according to UnicodeData.txt.
*
* @param c the character to be tested
* @return a value of type int, the character category.
* @see UCharCategory
@ -698,6 +698,16 @@ u_charCellWidth(UChar32 c);
U_CAPI int8_t U_EXPORT2
u_charType(UChar32 c);
/**
* Returns the combining class of the code point as specified in UnicodeData.txt.
*
* @param c the code point of the character
* @return the combining class of the character
* @draft
*/
U_CAPI uint8_t U_EXPORT2
u_getCombiningClass(UChar32 c);
/**
* Retrives the decimal numeric value of a digit character.
*
@ -959,11 +969,11 @@ u_isJavaIDPart(UChar32 c);
/**
* The given character is mapped to its lowercase equivalent according to
* Unicode 2.1.2; if the character has no lowercase equivalent, the character
* UnicodeData.txt; if the character has no lowercase equivalent, the character
* itself is returned.
* <P>
* A character has a lowercase equivalent if and only if a lowercase mapping
* is specified for the character in the Unicode 2.1.2 attribute table.
* is specified for the character in the UnicodeData.txt attribute table.
* <P>
* u_tolower() only deals with the general letter case conversion.
* For language specific case conversion behavior, use ustrToUpper().
@ -979,8 +989,8 @@ U_CAPI UChar32 U_EXPORT2
u_tolower(UChar32 c);
/**
* The given character is mapped to its uppercase equivalent according to Unicode
* 2.1.2; if the character has no uppercase equivalent, the character itself is
* The given character is mapped to its uppercase equivalent according to UnicodeData.txt;
* if the character has no uppercase equivalent, the character itself is
* returned.
* <P>
* u_toupper() only deals with the general letter case conversion.
@ -996,13 +1006,13 @@ u_tolower(UChar32 c);
U_CAPI UChar32 U_EXPORT2
u_toupper(UChar32 c);
/**
* The given character is mapped to its titlecase equivalent according to Unicode
* 2.1.2. There are only four Unicode characters that are truly titlecase forms
* The given character is mapped to its titlecase equivalent according to UnicodeData.txt.
* There are only four Unicode characters that are truly titlecase forms
* that are distinct from uppercase forms. As a rule, if a character has no
* true titlecase equivalent, its uppercase equivalent is returned.
* <P>
* A character has a titlecase equivalent if and only if a titlecase mapping
* is specified for the character in the Unicode 2.1.2 data.
* is specified for the character in the UnicodeData.txt data.
*
* @param ch the character to be converted
* @return the titlecase equivalent of the character, if any;